Comparative study of the kinetics and equilibrium of nickel( II) biosorption from aqueous solutions by free and immobilized biomass of A spergillus awamori.

Autor: Shahverdi, Fatemeh, Ahmadi, Mitra, Avazmoghadam, Sima, Faramarzi, Mohammad Ali
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Zdroj: Environmental Progress & Sustainable Energy; Sep/Oct2015, Vol. 34 Issue 5, p1356-1364, 9p
Abstrakt: In this research, the kinetics and equilibrium of nickel(II) biosorption were studied in aqueous solutions using batch technique. The biosorption was carried on Ca-alginate beads, on nonliving mycelium of Aspergillus awamori immobilized on Ca-alginate, and on free fungal biomass. The biosorbents were characterized by FTIR and SEM analyses. The experimental data were analyzed in terms of pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models. It was observed that the biosorption process of Ni(II) ions followed well pseudo-second-order model on all biosorbents. The experimental results showed that biosorption equilibrium on blank Ca-alginate, free biomass, and immobilized fungal biomass fit better to the Langmuir model when compared with the Freundlich model in concentration range studied (25-75 mg L−1). The results showed that the maximum monolayer biosorption capacity of the immobilized fungal biosorbent was 8.34 mg g−1 when compared with the blank Ca-alginate and free biomass with 4.63 and 7.13 mg g−1, respectively. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1356-1364, 2015 [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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